Jatropha curcas L. oil extracted by switchable solvent N, N-dimethylcyclohexylamine for biodiesel production

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• 作者：Shanjin Zeng¹ ; ² ; Chuandong Tao¹ ; ² ; Richard Parnas³ ; Wei Jiang¹ ; Bin Liang¹ ; ² ; Yingying Liu² ; Houfang Lu¹ ; ² ; ^{luhouf@163.com}
• 关键词：Jatrapha curcus L. oil ; Extraction ; N ; N-dimethylcyclohexylamine ; Switchable hydrophilic solvent ; Biodiesel
• 刊名：Chinese Journal of Chemical Engineering
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：24
• 期：11
• 页码：1640-1646
• 全文大小：843 K
• 卷排序：24

文摘

Biodiesel, which is a renewable and environmentally friendly fuel, has been studied widely to help remedy increasing environmental problems. One of the key processes of biodiesel production is oil extraction from oilseed materials. Switchable solvents can reversibly change from molecular to ionic solvents under atmospheric CO2, and can be used for oil extraction. N, N-dimethylcyclohexylamine (DMCHA), a switchable solvent, was used to extract oil from Jatropha curcas L. oil seeds to produce biodiesel. The appropriate extraction conditions were: 1:2 ratio of seed mass to DMCHA volume, 0.3–1 mm particle size, 200 r·min− 1 agitation speed, 60 min extraction time, and 30 °C extraction temperature. The extraction ratio was about 83%. This solvent extracted the oil more efficiently than hexane, and is much less volatile. By bubbling CO2 under 1 atm and 25 °C for 5 h, the oil was separated, and DMCHA was recovered after releasing CO2 by bubbling N2 under 1 atm and 60 °C for 2 h. The residual solvent content in oil was about 1.7%. Selectivity of DMCHA was evaluated by detecting the protein and sugar content in oil. Using the oil with residual solvent to conduct transesterification process, the oil conversion ratio was approximately 99.5%.